Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM1000000026OCY
Model Year Start: 2023 Model: Corolla Prod Date Range: [09/2022 -           ]
Title: WIPER / WASHER: WIPER AND WASHER SYSTEM (for HV Model): TERMINALS OF ECU; 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]

TERMINALS OF ECU

CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND POWER DISTRIBUTION BOX ASSEMBLY

(a) Disconnect the power distribution box assembly and main body ECU (multiplex network body ECU) connectors.

(b) Measure the voltage and resistance according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

8D-1 - Body ground

LA - Body ground

Ground

Always

Below 1 Ω

8F-23 - Body ground

B - Body ground

Auxiliary battery power supply

Power switch off

11 to 14 V

8J-1 - Body ground

B - Body ground

Auxiliary battery power supply

Power switch off

11 to 14 V

(c) Connect the power distribution box assembly and main body ECU (multiplex network body ECU) connectors.

(d) Measure the voltage and check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

I84-5 (CXP1) - Body ground

BR - Body ground

CXPI communication line

Power switch on (IG)

Pulse generation

I85-6 (WPS) - Body ground

R - Body ground

WIPER Relay operation signal

Power switch on (IG)

11 to 14 V

Less than approximately 60 seconds after power switch turned off

Approximately 60 seconds or more after power switch turned off

Below 1 V

CHECK WINDSHIELD WIPER RELAY

(a) Disconnect the A55 and A56 windshield wiper relay connectors.

(b) Measure the voltage and resistance according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

A55-3 (E) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

A55-5 (EWS) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

A55-6 (IGWS) - Body ground

L - Body ground

Washer circuit IG power source

Power switch off

Below 1 V

Power switch on (IG)

11 to 14 V

A55-8 (+B) - Body ground

B - Body ground

Power switch on (IG) signal (Power source circuit)

Power switch on (IG)

11 to 14 V

Less than approximately 60 seconds after power switch turned off

Approximately 60 seconds or more after power switch turned off

Below 1 V

A56-5 (ES) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

(c) Connect the A55 and A56 windshield wiper relay connectors.

(d) Measure the voltage and resistance and check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

A55-1 (+WR) - Body ground

G - Body ground

Front washer operation signal

Power switch on (IG), front washer operating

11 to 14 V

A55-2 (+1) - Body ground

R - Body ground

LO operation signal to windshield wiper motor assembly

Power switch on (IG), windshield wiper motor assembly operating in LO

11 to 14 V

A55-4 (+2) - Body ground

W - Body ground

HI operation signal to windshield wiper motor assembly

Power switch on (IG), windshield wiper motor assembly operating in HI

11 to 14 V

A56-3 (2S) - Body ground

R - Body ground

Windshield wiper motor assembly HI operation signal

Windshield wiper motor assembly stopped

4.5 to 5.5 V

Windshield wiper motor assembly operating in HI

Below 1 V

A56-4 (MPX1) - Body ground

P - Body ground

CXPI communication line

Power switch on (IG)

Pulse generation

Less than approximately 100 seconds after power switch turned off

Approximately 100 seconds or more after power switch turned off

11 to 14 V

A56-6 (+SM) - Body ground

G - Body ground

Windshield wiper motor assembly position detection signal

Windshield wiper motor assembly in LO or HI operation

Below 1 V ←→ 11 to 14V

Windshield wiper motor assembly stopped

Below 1 V

CHECK COMBINATION METER ASSEMBLY (w/ Level Warning Switch)

Click here 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM (except 12.3 Inch Display): TERMINALS OF ECU 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM (except 12.3 Inch Display): TERMINALS OF ECU